"use client";

import { eateryClient } from "@/lib/apollo-clients";
import { useAuth } from "@/lib/auth-context";
import {
  MenuItemEntity,
  addMenuItemMutation,
  allEateriesQuery,
} from "@/lib/types";
import { gql } from "@apollo/client";
import { useMutation, useQuery } from "@apollo/client/react";
import { useEffect, useState } from "react";

const GET_EATERY_MENU = gql`
  query GetEateryMenu {
    allEateries {
      id
      menuItems {
        id
        name
        price
      }
    }
  }
`;

const ADD_MENU_ITEM = gql`
  mutation addMenuItem($menuItem: AddMenuItemInput!) {
    addMenuItem(menuItem: $menuItem) {
      id
      name
      price
    }
  }
`;

function formatPrice(price: number) {
  return price.toLocaleString("vi-VN") + "đ";
}

export default function MenuItemsTab() {
  const { user } = useAuth();
  const [menuItems, setMenuItems] = useState<MenuItemEntity[]>([]);

  const {
    data,
    loading: gqlLoading,
    error: gqlError,
  } = useQuery<allEateriesQuery>(GET_EATERY_MENU, {
    client: eateryClient,
    fetchPolicy: "network-only",
  });

  const [mutateAddMenuItem] = useMutation<addMenuItemMutation>(ADD_MENU_ITEM, {
    client: eateryClient,
  });

  const [showForm, setShowForm] = useState(false);
  const [newName, setNewName] = useState("");
  const [newPrice, setNewPrice] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const [submitError, setSubmitError] = useState<string | null>(null);

  useEffect(() => {
    if (data?.allEateries?.[0]) {
      setMenuItems(data.allEateries[0].menuItems);
    }
  }, [data]);

  const handleAdd = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!newName.trim() || !newPrice) return;

    setSubmitting(true);
    setSubmitError(null);

    try {
      const { data: mutationResult } = await mutateAddMenuItem({
        variables: {
          menuItem: {
            name: newName,
            price: parseFloat(newPrice),
          },
        },
      });

      if (mutationResult?.addMenuItem) {
        setMenuItems((prev) => [...prev, mutationResult.addMenuItem]);
        closeForm();
      }
    } catch (err: any) {
      console.error("Mutation Error:", err);
      setSubmitError(err.message || "Không thể thêm món. Vui lòng thử lại.");
    } finally {
      setSubmitting(false);
    }
  };

  const closeForm = () => {
    setShowForm(false);
    setSubmitError(null);
    setNewName("");
    setNewPrice("");
  };

  if (gqlLoading && menuItems.length === 0)
    return <div className="py-16 text-center">Đang tải menu...</div>;
  if (gqlError)
    return (
      <div className="py-16 text-center text-red-500">
        Lỗi: {gqlError.message}
      </div>
    );

  return (
    <div className="space-y-4">
      {/* Toolbar */}
      <div className="flex items-center justify-between">
        <p className="text-sm text-(--color-text-muted)">
          <strong className="text-foreground">{menuItems.length}</strong> món
          trong menu
        </p>
        <button
          onClick={() => setShowForm(true)}
          className="flex cursor-pointer items-center gap-2 rounded-xl border-none bg-(--color-primary) px-4 py-2 text-sm font-semibold text-white transition hover:bg-(--color-primary-dark) active:scale-95"
        >
          <i className="fa-solid fa-plus"></i>
          <span className="hidden sm:inline">Thêm món</span>
        </button>
      </div>

      {/* Table */}
      <div className="overflow-x-auto rounded-2xl border border-(--color-border-light) bg-white shadow-sm">
        <table className="min-w-full divide-y divide-(--color-border-light) text-sm">
          <thead className="bg-background">
            <tr>
              <th className="px-4 py-3 text-left font-semibold text-(--color-text-secondary)">
                Tên món
              </th>
              <th className="px-4 py-3 text-right font-semibold text-(--color-text-secondary)">
                Giá
              </th>
            </tr>
          </thead>
          <tbody className="divide-y divide-(--color-border-light)">
            {menuItems.length === 0 ? (
              <tr>
                <td
                  colSpan={2}
                  className="py-12 text-center text-(--color-text-muted)"
                >
                  <i className="fa-solid fa-bowl-food mb-2 block text-3xl opacity-30"></i>
                  Chưa có món nào trong menu
                </td>
              </tr>
            ) : (
              menuItems.map((item) => (
                <tr
                  key={item.id}
                  className="hover:bg-background transition-colors"
                >
                  <td className="px-4 py-3">
                    <p className="text-foreground font-medium">{item.name}</p>
                  </td>
                  <td className="px-4 py-3 text-right font-semibold text-(--color-primary)">
                    {formatPrice(item.price)}
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      {/* Add Item Modal */}
      {showForm && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/30 backdrop-blur-sm">
          <div className="w-full max-w-sm rounded-2xl bg-white p-6 shadow-lg">
            <div className="mb-4 flex items-center justify-between">
              <h2 className="text-foreground font-bold">Thêm món mới</h2>
              <button
                onClick={closeForm}
                className="flex h-8 w-8 cursor-pointer items-center justify-center rounded-lg border-none bg-transparent text-(--color-text-muted) hover:text-(--color-primary)"
              >
                <i className="fa-solid fa-xmark"></i>
              </button>
            </div>

            <form onSubmit={handleAdd} className="space-y-4">
              <div>
                <label className="mb-1.5 block text-sm font-medium text-(--color-text-secondary)">
                  Tên món <span className="text-red-500">*</span>
                </label>
                <input
                  type="text"
                  value={newName}
                  onChange={(e) => setNewName(e.target.value)}
                  placeholder="Nhập tên món..."
                  required
                  className="text-foreground w-full rounded-xl border border-(--color-border) bg-white px-3 py-2 text-sm transition outline-none focus:border-(--color-primary) focus:ring-2 focus:ring-(--color-primary)/20"
                />
              </div>

              <div>
                <label className="mb-1.5 block text-sm font-medium text-(--color-text-secondary)">
                  Giá (VNĐ) <span className="text-red-500">*</span>
                </label>
                <input
                  type="number"
                  value={newPrice}
                  onChange={(e) => setNewPrice(e.target.value)}
                  placeholder="Nhập giá..."
                  required
                  min={0}
                  step={500}
                  className="text-foreground w-full rounded-xl border border-(--color-border) bg-white px-3 py-2 text-sm transition outline-none focus:border-(--color-primary) focus:ring-2 focus:ring-(--color-primary)/20"
                />
              </div>

              {submitError && (
                <p className="text-sm text-red-500">
                  <i className="fa-solid fa-circle-exclamation mr-1"></i>
                  {submitError}
                </p>
              )}

              <div className="flex gap-2 pt-2">
                <button
                  type="button"
                  onClick={closeForm}
                  className="hover:bg-background flex-1 cursor-pointer rounded-xl border border-(--color-border-light) bg-transparent py-2 text-sm font-medium text-(--color-text-secondary) transition"
                >
                  Hủy
                </button>
                <button
                  type="submit"
                  disabled={submitting}
                  className="flex-1 cursor-pointer rounded-xl border-none bg-(--color-primary) py-2 text-sm font-semibold text-white transition hover:bg-(--color-primary-dark) disabled:opacity-60"
                >
                  {submitting ? (
                    <>
                      <i className="fa-solid fa-spinner mr-1 animate-spin"></i>
                      Đang lưu...
                    </>
                  ) : (
                    "Thêm món"
                  )}
                </button>
              </div>
            </form>
          </div>
        </div>
      )}
    </div>
  );
}